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Showing 141 - 160 of 515 results
  • Estimating the Reduction in Future FleetLevel CO2 Emissions from Sustainable Aviation Fuel
    Estimating the Reduction in Future Fleet-Level CO2 Emissions from Sustainable Aviation Fuel
    Jain, Samarth ;
    Chao, Hsun
    2021-11-01 | PDF
    With rising concerns over commercial aviation’s contribution to global carbon emissions, the aviation industry faces tremendous pressure to adopt advanced solutions for reducing its share of CO<sub>2</sub> emissions. One near-term potential solution to mitigate this global emissions situation is to operate existing aircraft with sustainable aviatio ...
  • Optimal N Application Rates on Switchgrass for Producers and a Biorefinery
    Optimal N Application Rates on Switchgrass for Producers and a Biorefinery
    Robertson, Keven Alan ;
    English, Burton C
    2021-11-01 | PDF
    This study analyzes the effects of N fertilizer application rates on profitability of growing switchgrass and using the feedstock in a pyrolysis biorefinery facility to create a source of sustainable aviation fuel (SAF) supply in Tennessee. Switchgrass (Panicum virgatum L.) is a perennial bunchgrass native to North America with traits suitable for ...
  • Lower Heating Value of Jet Fuel From Hydrocarbon Class Concentration Data and ThermoChemical Reference Data An Uncertainty Quantification
    Lower Heating Value of Jet Fuel From Hydrocarbon Class Concentration Data and Thermo-Chemical Reference Data: An Uncertainty Quantification
    Boehm, Randall C ;
    Yang, Zhibin
    2021-11-01 | PDF
    A detailed assessment is presented on the calculation and uncertainty of the lower heating value (net heat of combustion) of conventional and sustainable aviation fuels, from hydrocarbon class concentration measurements, reference molecular heats of formation, and the uncertainties of these reference heats of formation. Calculations using this pape ...
  • Dataset for TechnoEconomic Analysis of Catalytic Hydrothermolysis Pathway for Jet Fuel Production
    Dataset for Techno-Economic Analysis of Catalytic Hydrothermolysis Pathway for Jet Fuel Production
    Eswaran, Sudha ;
    Subramaniam, Senthil
    2021-10-01 | PDF
    This detail the economics of Catalytic Hydrothermolysis (CH), an approve pathway for sustainable aviation fuel (SAF) production. Techno-economic analysis was conducted with the assumption of CH processing facility that process 832 metric tonnes per day of feedstock into renewable fuels such as SAF, gasoline and diesel. Economic data includes estima ...
  • Permuted Proper Orthogonal Decomposition for Analysis of Advecting Structures
    Permuted Proper Orthogonal Decomposition for Analysis of Advecting Structures
    Ek, Hanna ;
    Nair, Vedanth
    2021-10-01 | PDF
    Flow data are often decomposed using proper orthogonal decomposition (POD) of the space–time separated form,.... which targets spatially correlated flow structures in an optimal manner. This paper analyses permuted POD (PPOD), which decomposes data as q (x, t) = ..... aj (n) φj (s, t), where x = (s,n) is a general spatial coordinate system, s is th ...
  • Production of Sustainable Aviation Fuels in Petroleum Refineries Evaluation of New BioRefinery Concepts
    Production of Sustainable Aviation Fuels in Petroleum Refineries: Evaluation of New Bio-Refinery Concepts
    Tanzil, Abid H ;
    Brandt, Kristin
    2021-10-01 | PDF
    The potential for petroleum refineries (PRs) to integrate sustainable aviation fuel (SAF) technologies is manifold, unlike with other existing industrial infrastructures that lack such technical similarities. A midsize PR with a crude oil capacity of 120,000 barrels per day was analyzed in this study to determine the feasibility of integrating five ...
  • LongTerm Aircraft Noise Exposure and Risk of Hypertension in the Nurses Health Studies
    Long-Term Aircraft Noise Exposure and Risk of Hypertension in the Nurses’ Health Studies
    Kim, Chloe S ;
    Grady, Stephanie T.
    2021-10-01 | PDF
    Background: Aircraft noise can affect populations living near airports. Chronic exposure to aircraft noise has been associated with cardiovascular disease, including hypertension. However, previous studies have been limited in their ability to characterize noise exposures over time and to adequately control for confounders. Objectives: The aim of t ...
  • A Handbook for Effective Signaling in Air Traffic Control Phase 2 Signaling Philosophy
    A Handbook for Effective Signaling in Air Traffic Control Phase 2: Signaling Philosophy
    Ruskin, Keith J ;
    Corvin, Chase
    2021-09-01 | PDF
    An air traffic control (ATC) facility is a dynamic, high-stress environment that requires that controllers rapidly detect problems and make time-critical decisions. Signals (alarms, alerts, and warnings) are essential for alerting controllers to potential collisions and other adverse events, but they can increase operators’ response times and decre ...
  • Water Leaching for Improving Fuel Properties of Pongamia Pod Informing Process Design
    Water Leaching for Improving Fuel Properties of Pongamia Pod: Informing Process Design
    Fu, Jinxia ;
    Allen, Gabriel
    2021-08-01 | PDF
    Pongamia seedpods are recognized as a potential feedstock for sustainable aviation fuel production due to the relatively high oil content of the seeds. Pongamia pods are byproduct residues available after seed separation. Pods have high chlorine and potassium content that may be problematic in thermochemical energy conversion systems. Leaching expe ...
  • Stratospheric Ozone and Climate Forcing Sensitivity to Cruise Altitudes for Fleets of Potential Supersonic Transport Aircraft
    Stratospheric Ozone and Climate Forcing Sensitivity to Cruise Altitudes for Fleets of Potential Supersonic Transport Aircraft
    Zhang, Jun ;
    Wuebbles, Donald J.
    2021-08-01 | PDF
    The possibility of commercial and business supersonic aircraft that fly in the lower stratosphere is being discussed and specific designs are under consideration. Emissions from supersonic transports have raised crucial environmental concerns regarding ozone and climate. The atmospheric response is sensitive to a range of factors regarding aircraft ...
  • Comparing Alternative Jet Fuel Dependencies Between Combustors of Different Size and Mixing Approaches
    Comparing Alternative Jet Fuel Dependencies Between Combustors of Different Size and Mixing Approaches
    Boehm, Randall C ;
    Colborn , Jennifer G
    2021-08-01 | PDF
    Analyses used to reveal fuel dependencies on lean blow out and ignition at specific operating conditions in specific combustors show inconsistent trends with each other. Such variety is however consistent with the occurrence of transitions between the governing physical phenomena as the ratios between evaporation, mixing, or chemical time scales wi ...
  • Sustainable Alternative Fuel Effects on Energy Consumption of Jet Engines
    Sustainable Alternative Fuel Effects on Energy Consumption of Jet Engines
    Boehm, Randall C ;
    Scholla, Logan C
    2021-07-01 | PDF
    High thermal stability enables engine manufacturers to increase the reliance on fuel as a heat sink while reducing the reliance on air, which wastes the energy used to compress it or increases aircraft drag. While the direct impact of waste heat recovery can translate into an energy savings of 0.2% if the maximum fuel temperature limit is increased ...
  • Noise Model Validation using RealWorld Operations Data
    Noise Model Validation using RealWorld Operations Data
    Gabrielian, Ana ;
    Puranik, Tejas G
    2021-07-01 | PDF
    The mitigation of aviation environmental effects is one of the key enablers to sustainable aviation growth. In order to perform mitigation efforts, however, it is required that the effects themselves be modeled with a high level of accuracy. The Aviation Environmental Design Tool (AEDT) offers the capability to model aircraft performance, fuel burn ...
  • FAA Center of Excellence Alternative Jet Fuels Environment Annual Technical Report 2019 For the Period October 1 2019 September 30 2020
    FAA Center of Excellence Alternative Jet Fuels & Environment: Annual Technical Report 2019: For the Period October 1, 2019 - September 30, 2020
    ASCENT Aviation Sustainability Center
    2021-06-01 | PDF
    This report covers the period October 1, 2019 through September 30, 2020. The Center was established by the authority of FAA solicitation 13-C-AJFE-Solicitation. During that time the ASCENT team launched a new website, which can be viewed at ascent.aero. The next meeting will be held virtually April 27-29, 2021.
  • Block 2 Procedure Recommendations for Boston Logan Airport Community Noise Reduction
    Block 2 Procedure Recommendations for Boston Logan Airport Community Noise Reduction
    Hansman, R. John ;
    Salgueiro, Sandro
    2021-06-01 | PDF
    Recent developments in navigation and surveillance technology have enabled new high-precision departure and arrival procedures using GPS and Performance-Based Navigation (PBN) standards. These procedures have proven effective for reducing fuel consumption and streamlining some aspects of air traffic control. However, flight tracks that were previou ...
  • Consumer Preferences and Willingness to Pay for Potting Mix with Biocharan Energy Feedstock
    Consumer Preferences and Willingness to Pay for Potting Mix with Biocharan Energy Feedstock
    Thomas, McKenzie ;
    Jensen, Kimberly L
    2021-06-01 | PDF
    Biochar is a co-product of advanced biofuels production from feedstocks including food, agricultural, wood wastes, or dedicated energy crops. Markets for soil amendments using biochar are emerging, but little is known about consumer preferences and willingness to pay (WTP) for these products or the depth of the products’ market potential for this p ...
  • 2020 Literature Review on Secondary Sonic Boom
    2020 Literature Review on Secondary Sonic Boom
    Sparrow, Victor W. ;
    Riegel, Kim
    2021-05-01 | PDF
    This Forum Acusticum paper provides a literature review regarding secondary sonic booms as of October 2020. It is hoped that this document will be useful for anyone studying secondary sonic booms in the future.
  • Farmer Interest In and Willingness To Grow Pennycress as an Energy Feedstock
    Farmer Interest In and Willingness To Grow Pennycress as an Energy Feedstock
    Zhou, Xia Vivian ;
    Jensen, Kimberly L
    2021-04-01 | PDF
    Pennycress can be used as a renewable biomass because its harvested seeds can be converted into biofuel, supplying, for example the aviation industry. Pennycress can be adopted as a winter cover crop to make extra profit in addition to summer cash crops. This study ascertains influences on row crop farmers’ interest in growing pennycress to supply ...
  • Estimating Induced Land Use Change Emissions for Sustainable Aviation Biofuel Pathways
    Estimating Induced Land Use Change Emissions for Sustainable Aviation Biofuel Pathways
    Zhao, Xin ;
    Taheripour, Farzad
    2021-03-01 | PDF
    Sustainable aviation fuels (SAFs) are expected to play an essential role in achieving the aviation industries' goal of carbon-neutral growth. However, producing biomass-based SAFs may induce changes in global land use and the associated carbon stock. The induced land use change (ILUC) emissions, as a part of the full life-cycle emissions for SAF pa ...
  • Assessing the Importance of Nonlinearity for Aircraft Emissions Impact on O and PM
    Assessing the Importance of Nonlinearity for Aircraft Emissions’ Impact on O₃ and PM₂.₅
    Arter, Calvin A ;
    Arunachalam, Saravanan
    2021-03-01 | PDF
    In this study the authors utilize the Decoupled Direct Method (HDDM-3D) as implemented in the Community Multiscale Air Quality Model (CMAQ) to calculate first and second order sensitivity coefficients of O₃ and PM₂.₅ concentrations with respect to aviation emissions during landing and takeoff (LTO) cycles at ten individual airports; five located in ...
141 - 160 / 515